<!DOCTYPE html>
<html>
<head>
	<title>美人尖</title>
</head>
<body>
	<style type="text/css">
		div{
		width:0px;
		height:0px;
		border-top-style:solid;
		border-top-color: red;
		border-top-width: 20px;
		
		border-left-style: solid;
		border-left-width: 20px;
		border-left-color: white;
		
		border-right-style: solid;
		border-right-width: 20px;
		border-right-color: white;
		
		}
	</style>
	<div></div>
</body>
</html>